author | Claus Gittinger <cg@exept.de> |
Sat, 30 Dec 2000 20:40:49 +0100 | |
changeset 1450 | 674a26f4a68f |
parent 1449 | 3229e8ab7820 |
child 1451 | 717a60fa30f0 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1997 by eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libview2' }" |
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parents:
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Object subclass:#RIFFReader |
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instanceVariableNames:'inStream fileType streamTypes client msb' |
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classVariableNames:'UnsupportedFormatErrorSignal' |
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poolDictionaries:'' |
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category:'System-Support-FileFormats' |
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! |
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!RIFFReader class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1997 by eXept Software AG |
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All Rights Reserved |
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||
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
|
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inclusion of the above copyright notice. This software may not |
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32 |
be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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" |
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Abstract helper class to read RIFF files. See concrete subclasses for details. |
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RIFF is the abstract base-format used for a whole bunch of concrete file formats: |
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WAV, AVI, AIF etc. |
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Concrete formats must be parsed by concrete readers. |
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Use: |
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define your own concrete reader, with methods getChunk_FOO:, |
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for each chunk type FOO you want to parse there. |
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Define your reader as a client to this reader, and let it processChunks. |
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See AVIReader for a concrete example. |
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This is in an experimental state and not yet finished. |
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The protocol may change. |
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! ! |
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!RIFFReader class methodsFor:'instance creation'! |
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fromFile:aFilename |
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|s reader| |
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s := aFilename asFilename readStream. |
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reader := self new fromStream:s. |
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s close. |
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^ reader |
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! ! |
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!RIFFReader class methodsFor:'class initialization'! |
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initialize |
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UnsupportedFormatErrorSignal isNil ifTrue:[ |
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UnsupportedFormatErrorSignal := ErrorSignal newSignalMayProceed:true. |
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UnsupportedFormatErrorSignal nameClass:self message:#unsupportedFormatErrorSignal. |
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]. |
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RIFFReader initialize |
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"Created: 4.4.1997 / 22:35:52 / cg" |
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"Modified: 5.4.1997 / 16:12:16 / cg" |
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! ! |
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!RIFFReader class methodsFor:'testing'! |
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isRIFFFile:aFileName |
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"return true, if aFileName contains RIFF-encoded data" |
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|data1 inStream| |
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inStream := aFileName asFilename readStream. |
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inStream isNil ifTrue:[^ false]. |
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inStream binary. |
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data1 := String new:4. |
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inStream nextBytes:4 into:data1. |
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inStream close. |
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^ (data1 = 'RIFF') |
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RIFFReader isRIFFFile:'bitmaps/magtape.xpm' |
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RIFFReader isRIFFFile:'/phys/exept/home/pd_stuff/movies/avi/drlair.avi' |
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RIFFReader isRIFFFile: '/usr/share/sounds/alsa/test.wav' |
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RIFFReader isRIFFFile: '../../goodies/sounds/testSounds/wav/gong.wav' |
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RIFFReader isRIFFFile: '../../goodies/sounds/testSounds/aif/instr/conga_hi.aiff' |
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" |
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"Created: 4.4.1997 / 22:35:52 / cg" |
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"Modified: 5.4.1997 / 16:12:16 / cg" |
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! |
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isRIFFFile:aFileName withType:type |
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"return true, if aFileName contains RIFF-encoded data of format:type" |
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|data1 len data3 inStream| |
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inStream := aFileName asFilename readStream. |
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inStream isNil ifTrue:[^ false]. |
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inStream binary. |
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data1 := String new:4. |
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inStream nextBytes:4 into:data1. |
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len := inStream nextLongMSB:true. |
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data3 := String new:4. |
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inStream nextBytes:4 into:data3. |
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inStream close. |
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data3 := data3 withoutTrailingSeparators. |
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((data1 = 'RIFF') |
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and:[data3 = type]) ifTrue:[ |
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^ true |
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]. |
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^ false. |
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RIFFReader isRIFFFile:'bitmaps/magtape.xpm' withType:'AVI ' |
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RIFFReader isRIFFFile:'/phys/exept/home/pd_stuff/movies/avi/drlair.avi' withType:'AVI' |
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RIFFReader isRIFFFile: '/usr/share/sounds/alsa/test.wav' withType:'WAVE' |
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" |
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"Created: 4.4.1997 / 22:35:52 / cg" |
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"Modified: 5.4.1997 / 16:12:16 / cg" |
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! ! |
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!RIFFReader methodsFor:'accessing'! |
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addStream:type |
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streamTypes add:type |
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! |
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client |
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"return the value of the instance variable 'client' (automatically generated)" |
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^ client |
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! |
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client:something |
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"set the value of the instance variable 'client' (automatically generated)" |
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client := something. |
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! |
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msb |
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"return the value of the instance variable 'msb' (automatically generated)" |
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^ msb |
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! |
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msb:something |
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"set the value of the instance variable 'msb' (automatically generated)" |
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msb := something. |
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! |
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streamTypes:something |
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"set the value of the instance variable 'streamTypes' (automatically generated)" |
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streamTypes := something. |
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! ! |
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!RIFFReader methodsFor:'reading from stream'! |
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fromStream:aStream |
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"read RIFF chunks from aStream. Process chunks in getChunkXXX methods |
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(usually redefined in concrete reader classes." |
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client := self. |
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self processStream:aStream |
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" |
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RIFFReader fromFile:'/phys/exept/home/pd_stuff/movies/avi/hangldm.avi' |
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RIFFReader fromFile:'../../goodies/sounds/testSounds/wav/gong.wav' |
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AVIReader fromFile:'/phys/exept/home/pd_stuff/movies/avi/hangldm.avi' |
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WAVFileReader fromFile:'/phys/exept/opt/office52/share/gallery/sounds/gong.wav' |
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AIFFFileReader fromFile:'/phys/exept/opt/office52/share/gallery/sounds/gong.wav' |
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" |
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"Modified: 17.4.1997 / 03:25:08 / cg" |
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! |
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getChunk |
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"get a single chunk" |
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|id sel sTyp chunkSize| |
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'getChunk -> ' infoPrint. |
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id := ' '. |
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(inStream nextBytes:4 into:id startingAt:1) ~~ 4 ifTrue:[ |
212 |
self error:'short chunk' mayProceed:true. |
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^ self |
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]. |
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chunkSize := inStream nextLongMSB:msb. |
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(id at:1) == $0 ifTrue:[ |
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sTyp := '_Unknown'. |
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streamTypes notNil ifTrue:[ |
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sTyp := streamTypes at:((id at:2) digitValue + 1) ifAbsent:nil. |
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]. |
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sel := 'getChunk_' , sTyp , '_' , (id copyFrom:3), ':'. |
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"/id infoPrint. ' -> ' infoPrint. sel infoPrintCR. |
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sel := sel asSymbolIfInterned. |
1437 | 226 |
(sel isNil or:[(client respondsTo:sel) not and:[(self respondsTo:sel) not]]) ifTrue:[ |
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sel := 'getChunk_' , sTyp , '_Unknown:'. |
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"/' ' infoPrint. id infoPrint. ' -> ' infoPrint. sel infoPrintCR. |
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sel := sel asSymbolIfInterned. |
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(sel isNil or:[(client respondsTo:sel) not and:[(self respondsTo:sel) not]]) ifTrue:[ |
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'[' infoPrint. ('getChunk_' , sTyp , '_' , (id copyFrom:3)) infoPrint. '] ' infoPrint. |
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sel := #'getChunk_Unknown:'. |
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"/' ' infoPrint. id infoPrint. ' -> ' infoPrint. sel infoPrintCR. |
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234 |
]. |
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] |
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] ifFalse:[ |
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(id at:4) == Character space ifTrue:[ |
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id := id copyTo:3 |
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239 |
]. |
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sel := ('getChunk_' , id , ':') asSymbolIfInterned. |
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(sel isNil or:[(client respondsTo:sel) not and:[(self respondsTo:sel) not]]) ifTrue:[ |
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'[' infoPrint. ('getChunk_' , id) infoPrint. '] ' infoPrint. |
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sel := #'getChunk_Unknown:' |
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244 |
]. |
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"/id infoPrint. ' -> ' infoPrint. sel infoPrintCR. |
525 | 246 |
]. |
247 |
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248 |
client perform:sel with:chunkSize ifNotUnderstood:[self perform:sel with:chunkSize]. |
525 | 249 |
'' infoPrintCR. |
250 |
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" |
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RIFFReader fromFile:'/phys/exept/home/pd_stuff/movies/avi/hangldm.avi' |
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AVIReader fromFile:'/phys/exept/home/pd_stuff/movies/avi/hangldm.avi' |
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254 |
" |
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255 |
|
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256 |
"Created: 4.4.1997 / 22:50:13 / cg" |
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"Modified: 5.4.1997 / 15:47:48 / cg" |
525 | 258 |
! |
259 |
||
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getChunk_DISP:chunkSize |
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261 |
"process (ignore) a DISP chunk" |
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262 |
|
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'getChunk_DISP -> ' infoPrint. |
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264 |
|
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265 |
self skipChunk:chunkSize |
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266 |
|
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267 |
"Created: 5.4.1997 / 15:19:10 / cg" |
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268 |
! |
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269 |
|
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getChunk_JUNK:chunkSize |
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"ignore JUNK chunk" |
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272 |
|
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'getChunk_JUNK -> ' infoPrint. |
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274 |
|
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self skipChunk:chunkSize |
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! |
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|
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getChunk_LIST:chunkSize |
525 | 279 |
"process a LIST chunk" |
280 |
||
281 |
'getChunk_LIST' infoPrint. |
|
282 |
||
283 |
inStream skip:4. |
|
284 |
||
285 |
" |
|
286 |
AVIReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi' |
|
541 | 287 |
RIFFReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi' |
288 |
RIFFReader fromFile:'/home2/cg/AFsp-V2R0/test/audiofiles/jg00b1ss.wav' |
|
525 | 289 |
" |
290 |
||
291 |
"Created: 4.4.1997 / 23:18:33 / cg" |
|
541 | 292 |
"Modified: 17.4.1997 / 03:22:15 / cg" |
525 | 293 |
! |
294 |
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getChunk_RIFF:chunkSize |
525 | 296 |
"process a RIFF chunk" |
297 |
||
1446 | 298 |
'getChunk_RIFF' infoPrintCR. |
525 | 299 |
|
1437 | 300 |
fileType := (inStream next:4) asString. |
1446 | 301 |
|
302 |
'fileType -> ' infoPrint. fileType infoPrint. |
|
525 | 303 |
! |
304 |
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getChunk_Unknown:chunkSize |
525 | 306 |
"ignore any other chunk" |
307 |
||
308 |
'getChunk_Unknown -> ' infoPrint. |
|
309 |
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self skipChunk:chunkSize |
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311 |
! |
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312 |
|
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processStream:aStream |
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314 |
"read RIFF chunks from aStream. Process chunks in getChunkXXX methods |
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315 |
(usually redefined in concrete reader classes." |
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316 |
|
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317 |
inStream := aStream. |
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318 |
inStream binary. |
1450 | 319 |
msb := false. |
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320 |
|
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321 |
[inStream atEnd] whileFalse:[ |
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322 |
client perform:#getChunk ifNotUnderstood:[self getChunk]. |
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323 |
]. |
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324 |
^ nil |
525 | 325 |
|
326 |
" |
|
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RIFFReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi' |
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328 |
RIFFReader fromFile:'/home2/cg/AFsp-V2R0/test/audiofiles/jg00b1ss.wav' |
525 | 329 |
" |
330 |
||
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331 |
"Modified: 17.4.1997 / 03:25:08 / cg" |
525 | 332 |
! |
333 |
||
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334 |
skipChunk:chunkSize |
525 | 335 |
"skip a chunk" |
336 |
||
337 |
|sz| |
|
338 |
||
339 |
'skipChunk' infoPrint. |
|
340 |
||
341 |
sz := chunkSize. |
|
342 |
(sz bitTest:1) ifTrue:[ |
|
343 |
sz := sz + 1 |
|
344 |
]. |
|
345 |
||
346 |
inStream skip:sz. |
|
347 |
! ! |
|
348 |
||
349 |
!RIFFReader class methodsFor:'documentation'! |
|
350 |
||
351 |
version |
|
1450 | 352 |
^ '$Header: /cvs/stx/stx/libview2/RIFFReader.st,v 1.8 2000-12-30 19:40:49 cg Exp $' |
525 | 353 |
! ! |
354 |
RIFFReader initialize! |